Double Seismic Zone for Deep Earthquakes in the Izu-Bonin Subduction Zone
- 25 February 1994
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 263 (5150) , 1116-1118
- https://doi.org/10.1126/science.263.5150.1116
Abstract
A double seismic zone for deep earthquakes was found in the Izu-Bonin region. An analysis of SP -converted phases confirms that the deep seismic zone consists of two layers separated by ∼20 kilometers. Numerical modeling of the thermal structure implies that the hypocenters are located along isotherms of 500° to 550°C, which is consistent with the hypothesis that deep earthquakes result from the phase transition of metastable olivine to a high-pressure phase in the subducting slab.Keywords
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